Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc4df3609d9be40…

MALICIOUS

PDF

33.4 KB Created: 2021-07-08 21:33:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6d2231ea579b34197ce299c5ddd6d785 SHA-1: 7ffc57173d6e03d4a52ff0dd2360f115346d65bb SHA-256: 4fc4df3609d9be400a7e3b187296fbe4ebaa600c8391469ea089f54bab0931fb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The primary malicious URL identified is http://netcdn.tw/app/431946152/robuxmatch-com-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/robuxmatch-com-free-robux-game-hack In PDF document text
    • https://www.tena-g.hr/files/dantdm-get-fre-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/robux-hack-pastebin-fast_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-hack-mobile-generator_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-on-samsung-tablet-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/www-coinmaster_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-assassin-hack-generator_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-free-items_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/robux-roblox-hackcom_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-hack-animation-script_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-make-a-free-roblox-shirt_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-assassin_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD5 21572 bytes
SHA-256: b874ee38a5383ce1a9f7cfb0cb5ac7f7f98497e0dc3e51b740cc1c981ae57ea6
font_01_sfnt_off00005d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1F 19244 bytes
SHA-256: 4ad327823a1ecd3abfe961c49d13734587955ac9e5f3e77b093970b56673cf6a

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